Googling 'Lustig criticism' gives you a good place to start. Though with nutritional science, everything is so far from consensus (and when there is a consensus, it's 20 years behind the science) that you should treat this as a jumping-off point to read the literature instead of an authoritative rebuttal.

http://www.alanaragonblog.com/2010/01/29/the-bitter-truth-ab...

There's a section about halfway down where he discusses Lustig's claims that things like HFCS are metabolized differently and negatively.

Because I'm not a doctor or a biologist, so I need a few counterpoints as checks in order not to be blinded. It's just a quick check valve while I read more about the subject.